Spiral Wound gaskets are suitable across a wide range of fluctuating service pressure – up to 250 bar – and temperature – from -200°C to 1000°C – depending on their construction.
The sealing element consists of a V-shaped metal strip spirally wound in combination with a sealing material filler.
The metal strip provides outstanding resilience, while the flexible sealing filler guarantees excellent sealing.
Common constructions:
No ring
Inner and outer diameters are reinforced with several plies of metal without filler to give greater stability and better compression and sealing characteristics. Suitable for tongue and groove or male and female or grooved to flat face flange assemblies.
Outer ring only
Utilizes an external ring which centers the gasket on flange face, provides additional radial strength to prevent gasket blow-out. and acts as a compression stop. A general purpose gasket suitable for use with flat face and raised face flanges up ANSI class 600.
Inner ring only
Solid inner metal ring acts as a compression stop and fills the annular space between flange bore and the inside diameter of the gasket. Designed to protect gasket windings from heat and corrosion, prevent accumulation of solids, reduce turbulent flow of process fluids, and minimize erosion at flange faces.
Outer and Inner ring
Suitable for flat face and raised face flanges and specified for high pressure/temperature service, this gasket features increased compressive force for blow-out prevention – up to ANSI class 2500 or where corrosive or toxic media are present.
Spiral-wound standard gaskets are suited for use on standard pipe flanges; while special design can be engineered and fabricated to cover a wide range of applications in pressure vessels such as valves, pumps, compressors, turbines, boilers, heat exchangers, etc.
By operating on the tension of the winding, and on the protruding of the filler, spiral wound gaskets can be constructed to require lower gasket stress, in order to be used on light flanges, where bolt load is limited. Conversely, provided that the bolt load is sufficient, SPW can be manufactured to provide extra resiliency, for extreme pressure applications
Spiral-wound gaskets are color coded to help expedite the selection and identity of the gaskets you need. The color on the outside edge of the centering ring identifies both the winding and filler materials. The metallic winding material is designated by a solid color. The filler materials are designated by color stripes at equal intervals on the outside edge of the centering ring.
